摘要
苯甲醛的Cannizzaro反应是有机化学实验教学中具有代表性的实验。实验涉及的基本操作多,操作步骤繁杂,学生通过实验可以分别得到液体和固体化合物的合成、纯化的训练。作为一个成熟、经典的有机化学教学实验,苯甲醛的Cannizzaro反应常被作为有机化学实验操作考核实验。但随着实验不断反复地进行,也出现了一些新的问题和情况。为了不断完善、准确地掌控该实验,文章在前期研究改进实验方案的基础上,不断探索,针对学生实验中由反应温度、碱的用量、机械搅拌、反应终点判断、亚硫酸氢钠洗涤、重结晶溶剂、苯甲醇脱水7方面的问题,深入探讨,解析原因,并提出了解决的办法。这不仅有助于提高教师业务水平和教学质量,而且对培养学生的创新意识和分析问题、解决问题的能力也大有益处。
The Cannizzaro reaction of benzaldehyde is a representative experiment in organic chemistry teaching experiment.This experiment is highly comprehensive,since it involves with many basic techniques and complicated operations.Students can get the corresponding training of the preparation and purification of liquid and solids respectively.Being a mature and classic teaching experiment,the Cannizzaro reaction of benzaldehyde is always used as the final operation test of organic chemistry experiment..However,some new problems and situations were founded when the experiment was carried out repeatedly.In order to make the experiment more perfect and accurate,Cannizzaro reaction of benzaldehyde was further studied.On the basis of our previous study results,this essay attempted to further discuss and provide solutions to some new problems arising from the students’experiment,such as:reaction temperature,the concentration of sodium hydroxide,the amount of solvent for recrystallization and the dehydration of benzyl alcohol,etc.The result of our study not only enhances the controllability of the Cannizzaro reaction of benzaldehyde,but also is very useful to improve the teaching quality of organic chemistry experiment,at the same time,it is contributed to accumulating faculties teaching experience.In addition,through addressing the aforementioned problems,it is helpful to improve the students’skills of analyzing and solving problems as well as the their awareness of innovation.
作者
王红
王海滨
卢传君
杨振平
强根荣
WANG Hong;WANG Haibin;LU Chuanjun;YANG Zhenping;QIANG Genrong(National Demonstration Center for Experimental Chemistry and Chemical Engineering Education,Zhejiang University of Technology,Hangzhou 310014,China)
出处
《实验室研究与探索》
CAS
北大核心
2019年第12期216-220,共5页
Research and Exploration In Laboratory
基金
浙江省高校实验室工作研究项目(YB201832)
